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The Structural Engineer

There are signs that some clients are being stressed by the shortcomings of competitive bidding for consultancy services. Blacklisting for firms and individuals who don’t deliver on unrealistic promises imposed by bid documents shows that weary clients are making angry outbursts of frustration. But who is at fault? E. Pennells

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The Structural Engineer

Pushout tests have been carried out on 40 short, concrete-filled steel hollow section tubes. Rectangular, square and circular sections were used in this experimental programme. Sixteen of the specimens were 450mm long, and the steel-concrete interfaces about 400mm long. These specimens were tested with and without the use of grade 4.6 black bolts as mechanical shear connectors. The rest of the tested specimens were of variable lengths, and their steel-concrete inte$ace was approximately 200, 400, or 600mm long. The interface of half the latter specimens was covered with oil prior to the casting of the concrete core. H. Shakir-Khalil

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Author – Shakir-Khalil, H

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The Structural Engineer

Pushout tests have been carried out on 56 concrete-jilled steel hollow section tubes. Square and circular sections were used in this series, and the same concrete mix wus used throughout the experimental programme. All specimens were 450mm-long, and the steel-concrete interface was about 400mm-long. The tested specimens consisted of an equal number of square and circular steel hollow section tubes. H. Shakir-Khalil

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Author – Shakir-Khalil, H

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The Structural Engineer

The design and construction of a cable-stayed steel roof for the 32 m cantilever structures over Yishun Indoor Stadium & Sports Complex - the first of its kind in Singapore - are described. The design philosophy, structural concept, structural modelling, and method of analysis are discussed. The design and construction of key structural elements such as the cable, steel mast, A-frame, truss and their structural behaviour are described in detail. The method of construction, connection, anchorage and prestressing of cables are highlighted. Dynamic analysis was carried out to determine and confirm the adequacy of structural design against dynamic loads, and the result is briefly discussed. J.M. Lau, K.B. Tan and C.C. Fong

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Author – Lau, J M;Tan, K B;Fong, C C

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